These meals also don't seem all that nutritious. A lot of the entrees are high in carbs but low in proteins and fats (affecting satiety and probably long term muscle mass that you'd need to fight off the zombies). Also not sure about their micronutrient profiles. Doesn't matter for 10 days but hard to survive long term with.
Something like Huel or Soylent offers way more consistent meal to meal nutrition for a little more money (double the price per serving, around $4 instead of $2). Not sure about the shelf life though.
Your local food co-op probably also sells bulk dehydrated hearty soups and meal mixes in powder form. Or get MREs from military surplus stores.